Work-supporting means for shoe-machines



,C. H. HOYT.

WORK SUPPORTING MEANS FOR SHOE MACHINES. APPLICATION FILED 0012-31. 1919. 1,3 9,771. Batented Dem-13,1921.

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Beverly, of Massachusetts, have invented certain Improveine'ntsin Work-Supporting. Means for Shoe-Machines, of which the following .de scription,"in-connection with the accornpany citizen) inth'e county of Essex and State ing drawingszis a specification, like :relerelite/characters on the. drawing; indicating like parts int'he several figures.

- This'inVention relates to machines for'use .in the manufacture of boots and shoes, and has more particular reference to Work supporting means for such machines. The in vention is herein-illustrated in. its applica tion to a machme for pulling uppers over lasts, and more particularly as applied to a type of construction of ,shoe supportillustrated in a prior application. of .R. l 'Mc "Feely. Serial l lo. 2 1L849 filed on Jan. 142:,

1918. his to he understood, howeventhat in many or its aspectsthe invention is not 'restricted'in "utility to pulling-over niachines HOPlllTlltfiCl to the particular type of shoesupport"illustrated in said application.

A {featureof the inVention consist-s in novel 'ineansfor mparting movement to a shoe support to position it in the correct relation to-a shoe. In the type of construction "illustrated the shoe support is mounted for initial"movenientfrom an idle position-to a position opposite to. that part of the shoe which it is to engage and for movement m; I" operations" of the successive 'a'utorn M each of w hich is nitiatecl by a movement oi thence into operative relation to the shoe. 'The'purpose; of such; an'arrangerhent, as applied to chine, isft positioned initiall in sucha locatio'nas not "example to a pullingover niaiermit the shoe support to be r rer'rere with the operators. View of the Worln In its application to a construction of this general type the invention provides "nevel' insane for imparting to the support its sheen being? "effected" inning. movement 'relativel y'. to h movement in the construction by, spring operated shoe; s

mechanism eer provided itiating the cycle of lh pulling-over m chines of the illustra t'ive type the'cyole of ""a'erations'is effected in i at terminahle stages 7' the starting means, it isrequired that 'S peoifinatio n of Itette-rs Eatent.

Application filed October 31, law.

the United States; residing at l of I the starting;

neiaesnrrs, .eesrenen *re 'Un'rmtn new a raaereiaa'rrerr er.

.wonK-snrromiine Means sea srrenaraenrnns.

Patentetllfi ee. l3, il. l%lt. lilerial in. 334,777.

during-the first stageof the cycle and the succeeding period of rest the support for the top ofthe forepart of the i inits idle position. I feature of-the invention, as a ing over and other inachin novel means oi? cijihtiely for read starting means in its first operative movement inelifective to cause.tlieyshoe'support to he moved from its idleposi-tion and for rendering it subsequently effective to cause such movement oi. the support.

shoe/he maintained Accordingly a further .t-further feature of the invention eensists in anovel constructional shoe support designed. to engage the shoe with adequate supporting pressure while insuring against the amilfcatien of undue pressure such as might damage the Worker involve the den'gerof hrealiging parts of the structure.

I The above and othcr'ifeatures of the im'en- @1011. including cer 11 details of construction and combinations ofparts, will nov he described with reference to the accompanying drawings and pointedout inthe elainis.

In the drawings 11 t Figure l is a View in side elevation of a -portion of a" pulling-over machine including mechanism in which the invention is em bodied. with parts broken away to reveal more iully the interior constructi Fig. 2 is ayiew in front. elevatien It the shoe support andportions of its 'eperating nenisni. showing the support in its idle Fig. 3 is a .detail perspectiveview on en enlarged 'scale of aportionof the media-- 1 i5 fl View showin parts of the eontroll). 0' mechanism of F '1, in a. i

hon. amt I t i s-al were partly in plan and w llullZOllttLl gate tion. on the line M 1, 1llustratm ig'certain details 0 oe support.

as shown and described in said "prior ap pheation, and more fully to certain details in prior patent No. 11 029.387 granted on June 11, 1912, upon an application of RF. McFeely, pulling-over machines of the type illustrated comprise in their general organization grippers 2 and 4 for engagingthe upper respectively at the, toe end and.

the starting of the machine to impart an upper pulling movement tosaid grippersand then to bring the parts of the machine to rest with the upper held under tension.

Such machines also usually include in their organization toe and side overlaying-and tacking devices 10 and 12 to wipe the margin of the upper inwardly over the bottom of the last and secure it in overwiped posi-l tion, these devices being operated by power driven mechanism in'the final stage of the .cycle of operations. While the particular number of stops which the machine makesin its cycle is immaterial t the present invention, it will be assumed i1 operations is effected in two stages, with a single period of rest between the beginning and the end of the cycle topermit any necessar adjustment of the upper while'it is held unc er tension by the grippers. The cycle of movements is controlled by well-known mechanism, as explained in said prior application and in greater detail in Patent No. 791,986 granted on June 6," 1905 upon an application of R. -F. Mc-Feely. It is sufi ficient for the purposes of the present dcscription to state that the controlling means includes a treadle 14 connected by means of a rod 16 to a lever 18 for imparting movement at the required time to a clutch actuating rod 20. whereby the machine is started at each stage of the cycle. After the upper has been pulled, and prior to the operative movement of the overlaying and tacking devices, a shoe support is moved into engagement with the top of the fore art of the shoeto assist in'positiomng and holding the shoe for the overlaying and tacking operations. As in the construction shown and described in said prior application, the shoe support herein shown comprises a pair of pads 22 arranged to engage the upper at opposite sides of the longitudinal median-line of the shoe, these pads being mounted on holders 24 which by the pressure of the pads against the shoe are caused to swing outwardly about a pivot 26 on a supporting stem 28 against the resistance of a spring 30. The stem 28 is mounted, ina manner hereinafter explained, in a bracket 32 which, has a depending part movable vertically in, a guideway' on the upper'end of a supporting arm 34 to adjust the pads 22 lengthwise of the shoe. ,A pin 36 in engagement with teeth '38 on the bracket 32 serves to retain the bracket in adjusted position. The arm 34 is mounted to swing laterally of the shoe. on a pivot 40 which is journaledin the upper end ofa lili) the cycle of theoppositesi a romithespring 64.,

nected by means of a link 46 to a slide 48 Wl'llCh is operated by a cam, not herein shown, to swing the arm about its bearing 44. As shown in Fi 2, the arm 34 in its idle position is inc med laterally of the shoe in such manner as to position the shoe engaging means substantiall at one side of the shoe to permit the wor to be readily presented to or removed from the machine and also to (permit the operator to have an' unobstructe view of the top of the'forepart of the shoe in order to determine whether the upper has been properly pulled with its lines in the correct relationto the last. From its idle position the arm 34 is swung about the axis of the pivot 40 to shoe engaging means substantial y opposite to the top of the iorepart of the shoe with the pads 22 in symmetrical relation to the sides of the shoe. -Upon the subsequent starting of the machine the arin 42 receives its operative movement fromthe cam slide 48 to swing the arm 34 about the axis of the pivot 44 and carry the shoe engaging present the portion ofthe support into operative rela- 18 and carrying at its upper end a wedge 6 block 54 w i'ch upon rearward swinging movement ofthe lever is arranged to engage the rounded end of a plunger 56 mounted in a socket in the lower end portion of the arm 34 and backed up by a spring 58.. It

will be understood that this spring is of sufblock ficient strength to render the wedge y to its effective to swin the-arm 34 latera re uired o adpxstably y the engagement of a nut 60 on the lower end of the arm 34 with the frame 61 of the machine, while permitting the plunger v56 to yield in response to the pres'-' sure of the wedge block w en the movement of the arm is stopped. Operative movement of the lever 50 is efiected by means of s rings 62 and 64 which are mounted respectively on rods 66 and 68 fast on blocks 70 rative position, as determined.

and 72 which are pivotally connected to the lever 50. The rod 66 is arranged to slide lengthwise through an opening m the frame ofthe machine and the rear end of the spring 62 abuts. against the frame. The rod 68 is arranged to slide similarly through an opening. in a laterally o'fl'set lug 74 on the lower end portion of the arm 42 and carries a nut 76.- for en a ment with the lug 74 on a "'to the lug 80 by means of aspring 87.

' cycle of operations of the machine the pro .By reference to Fig; 1 it willbe evident that the lug 74 by its engagement with the nut'76 is utilized to swing the arm 50 reversely to its idle position. In order to hold the arm in this position until such time as it is required to operate, the machine is provided with a latch 78' which is arranged to hook over a lug fast on the side. of the arm.\ This latch is secured to a pin 82 which is-mounte-d to turn in a bearing in a bracket 8% on the frame of themachine and is pro. vided at its oppositeend with an arm 86 on which is pivoted a block 88 in position-to be'cen'gaged by a'projection 90 on the. lever 18 stop- 92 on the arm 86 is arranged "to determine .the normal position of the block 88 in which the block is held yieldngly by means of .a spring-94. It will be evident that when the:treadle 14 is first operated to-initiate the first period of the jection 90 on the end of the lever 18 by its engagement with the block 88v serves to swing the arm '86 upwardly and thus to withdraw the latch 78 from engagement with the lug 80. At this time, however,

the arm 50- is positively held against'movement in response tothe pressure of the springs 62 and 64 by the action of the lug 74 on the nut 76, the arm 42 being held in the position illustrated in Fig. 1 by means of its calm operated mechanism. In the movement of the ;lever 18 the projection 90 finally slips past the block 88, whereupon the latch 78 is returned into operative relation When the lever 18 is returned to its initial position .upon the release of the trfeadle, the-- block 88'yie1ds .to permit the projection 90 to pass and resume its initial relation to the block. 'Inthe first period of the cycle.

wherein the pulling of the upper is effected as hereinbefore explained, the slide 48 receives a short opera'tivemovement such as to swing the arin 42 about its bearing 44 a sufiicient distance tospace the lug 74 from the nut'7 6, as indicated in Fig. 5, such movement, however, being insuflicient to swing the shoe engagingpor'tion of the support far enough rearwardly to interfere with its subsequent lateral movement. Upon the next depression of the treadleM to initiate the second and final period of the cycle of operations, the latch 78 is elevated as 'before, and upon its release of the lug 80 both 1 springs 62 and 64 are rendered effective to impart a swinging movement to the arm 50 of sufiicient extent to cause the'arm 34 to be swung'laterally to its required position by the action of the wedge block 54.- Immediately following such lateral swinging movement of the arm 34:,the slide 48 receives a further movement from its cam to swing the arms 42 and 34"ab0ut-the bearing 44110 their final operative position and to hold them in such position during the operation of the overlaying'and tacking devices. In the return of the parts to starting position the lug 7 4 on the arm 42 operates in engagement with the nut 76 to swing the arm 50 reversely until it is caught by the latch 78 which ylelds against the pressure of the spring 87 in response to the wedging action of the lug 80. Thearm 34: is thus released by the wedge block 54 and is permitted to swing by gravity to its idle position illustrated in Fig. 2. A spring pressed plug 96' on the lower endof thearm 34 on the opposite side from the nut 60 serves by en-- gagement with the frame 61 to limit" the swinging movement of the arm and to avoid any objectionable shock of im act.

y reference to Fig. 6 it wi l be seen thatv "the stem 28 which carries the shoe engaging pads is mounted sliding'ly in a socket in the bracket 32 and is provided within its hollow interior with a pair of springs 98 and '100 which are backed up 'by an ad justable thread plug 102. The spring 98 is considerably weaker than the spring 100 and is arranged to yield in response to resistance of the shoe to permit relative movement between the stem 28 and the bracket 32 as the arm 34 is swung into operative position, during which time the pads 22 are forced apart.

to stretch the upper and to seat them firmly against the shoe. The stronger spring, 100- is arranged to come into .play substantially at the time when the arm 34 arrives at its limit of operative movement to oppose a resistance to relative .movement between the sure applied to the'shoe in the overlaying and fastening operations it may yield in the move'mentot the support to operative posi tion sufiiciently to accommodate the mecha nism within the limits of safety to varying conditions encountered in operating upon shoes of different sizes-andst-yles;

Having described the invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1, In a machine of the class described, the combination with means for operating on a shoe, of a shoe support mounted for movement from an idle position intooperativerelation to. the shoe, and separately operated power mechanisms arranged to act in succession to initiate and to complete respectively .the movement of the support into operative relation to the shoe.

2. In a) machine of the class described, the

combination with means for operating on a shoe, of a shoe support mounted for movement from an idle position into operative relation to the shoe, power mechanism automatically operative after the starting of the machine to seat said support in its final operative relation to the shoe, and additional mechanism operative as an incident to the starting of the 'machine to impart an initial positioning movement to said support.

3. In a machine of the class described, the combination with means for operating on a shoe, of a shoe support mounted for movement from. an idle position into operative relation to the shoe, means for starting the machine, power mechanism automatically operative upon the starting of the machine to seat said support in its final operative relation to the shoe, and additional spring operated mechanism arranged to be actuated by said starting means and to impart an initial positioning movement to said support.

4. In a machine of the class the combination with means for operating on a shoe, of a shoe support mounted for positioning movement relatively to the shoe and for movement in a different direction into operative relation to the shoe, power operated mechanism for imparting said last named movement to the shoe support, and additional power-operated mechainsm for imparting tot-he shoe support said positioning movement.

I 5. In a machine of the class described, the combination with means for operating ona shoe, of a shoe support mounted for positioning movement relatively to the shoe and for movement in a different direction into operative relation to the shoe, power operated mechanisms arranged to act, each while the other is idle, to impart respectively said, different movements to the shoe support, and a single means of control for both said mechanisms.

6. In a machine of the class described,

the combination with means for operating on a shoe, of a. shoe support mounted for positioning movement relatively to the shoe and for movement in a diiferent direction into operative relation to the shoe, power mechanism arranged to operate upon the starting of the machine to impai t, sa d last named movement to the shoe support, and additional power mechanism for imparting t( r"'the' support said positioning movement described,

into operative relation to the shoe, power mechanism automatically operative after the startingof the machine to impart said last named movement to the shoe support, and additional mechanism operative as an incident to the starting of the machine to impart to the support said positioning movement.

8. In a machine of the class described, the combination with means for operating on a shoe, of a shoe support mounted for positioning movement relatively to the shoe and for movement in a different direction into operative relation to the shoe, means for starting the machine, power mechanism arran ed to operate upon the starting of the mac ine to impart said last named movement to the shoe support, and additional mechanism controlled by said starting means for imparting to the support said positionmg movement.

9. In a machine of the class described, the combination with means for operating on a shoe, of a shoe support mounted for positioning movement relatively to the shoe and for movement in a different direction into operative relation to the shoe, power operated means for imparting said last named movement to the shoe support, and additional spring operated means for imparting lation to the shoe, means for starting the machine, power means arranged to operate upon the starting of the machlne to impart said last named movement to the shoe support,

'and spring operated mechanism arranged to be controlled'by said starting means and to impart to the support said positioning movement.

11. In a machine of the class described, the combination with means for operating on'a shoe, of a shoe su port mounted for positioning movement re atively to the shoe and for additional movement into operative relation to the shoe, power operated means for imparting said last named movement to the shoe support, spring operated mechanism for imparting to the support said positioning movement, means for locking said mechanism in inoperative position, and means for operating said locking-means to release said mechanism.

12. In a machine of the class described, the combination with means for operating on a shoe, of a shoe support mounted for positioning movement relatively to the shoe and for additional movement into operative relation to the shoe, means for starting the machine,-power means arranged to operate I tion to the shoe, power operated means for .aaaayrr upon the starting of the machine to-impa'rt' said last namedmovement to the shoe sup port, spring} operated mechanism for impart mg to the SUPPOI'll-Stlltl positioning move a shoe, of a shoe support mounted for positioning movement relatively to the shoe and for additlonalmovement into operative relaimparting said lastvnamed movement to the shoe support, spring operated mechanism for imparting to the support vsaid positioning movement, lockingnieans for hplding said mechanism in inoperative position, means for-operating said locking means to release the mechanism, and additional power operated meanstor returning said mechanism i into position to be held by the locking'means.

14. in a machine of the class described, the combination with means for operating on a shoe, of ashoe support mounted for positioning movement relatively to the shoe,

spring operated mechanism for imparting said movement to the shoe support, locking means for holding; saidmechanism normally in inoperative position and means for open ating anism. I A

15.'ln a machine of the class described, the combination with means for'operating oria shoe, of "ashoe support mounted torv positioning movement relatively to the shoe, spring operated mechanlsm for imparting said movement to the shoe support, locking means arranged to be operated to release said mechanism, and additional means for re turning the mechanism into position to be held by said locking" means.

16. In a machine of the class described, the combination with means for operating on a shoe, of a shoe support mounted for movement from'an idle position into'operative 'relationto the shoe, spring" operated mechanism for imparting a positioning movement to said support, a locking device arranged toloe operated to release said mechanism, additional means for moving said snpportawa'y from-the shoe, and means operated by "the last named movement of the support to return said mechani m into posi tion to be held by said locking evifce. 3

, 17. In a machine of the class described, the

combination with means for operating on a shoe, oi a shoe support mounted for pose tioning movement relatively'to the shoe, means for starting" the machine, spring operated mechanism for imparting said move mentto the shoe support, locking means for holding said mechanism normally ininoperative position, and means for operatlng sa d saidlocking means to release the mecl1 part said preliminary locking means lov the starting meansito re lease saidmechanism. I

18; in a machine of the class described,

combination with means for operating. on-a shoe, or a shoe support mounted for movement in 'a direction, transverse to the height of the shoe to position substantially.

the shoe into supporting relationto said forepart, and separately operated power mechanisms for imparting to the support respectively said different movements.

19. In a machine of the class described,

to impart said last named movement to the shoe support, and spring operated mechanism for imparting'tosaldsupport its'positioning movement. I s

20. ln'a machine of the class described, the combinationwith-power means for 0popposite to the top-oi the t'ore'part of the shoe and for movementthence heightwiseof crating on a shoe and means for starting the machine in operation, of a'shoe support mounted for positioning movement in a di'- rection transverse to the height of the shoe to a location substantially opposite to the top [of the forepart-of the shoe and for moveinent thence heightwise oi the shoe intosupporting-relation to sa-id fonepart, power driven mechanism automatically operative after the starting of the machine to impart said last namedmovem'ent to the shoe supp'ort,'and additional mechanism operative as an incident to the starting of .the machine to impart to the support said positioning movement.

Q1. In a machine" of the classdescribed, the combination with means for operatinn;

on a shoe, oi a shoe support mounted for preliminary movement to a position' s ubstantially opposite tothe top of the forepartof the shoe and for movement thence into supporting relation to the fore part of the shoe, means for starting} the "machine, power means arranged to operate upon, the starting of the machine to impart' said last named movement to the shoe supportfand spring operated mechanism arranged'to be released by said starting means and to immovement to the sup Jort. 1 lin a machine of the class described, the combinationwith means for operating on a shoe, of a shoe supportmounted for swinging movement laterally of the shoe to a position substantially opposite to the top 0 the foremost of the shoe and for movement thence into engagement withthe shoe,

and Wedge mechanism for-impartingsaid lateral swinging movement to the shoe support before it is carried into engagement with the shoe.

23; In a. machinev of the class described, the combination with means for, operating. on a' shoe, of ashoe support comprising 'means for. engaging the shoe on the top of the forepart at opposite sides of-the longi{ tudinal median line of the shoe, an arm on which said shoe engaging means is supported, said arm being mounted for movement laterallyof the shoe and for movement in a different direction to carry said 1 top of the forepart at opposite sides of the longitudinal median line of'the shoe, an arm 'on which said members are mounted, said arm, being mounted for swinging movement laterally of the shoe and for movement in a d fferent dlrection to carry said members into engagement with the shoe, and means automatically operative to impart said lat-' eral swinging movement to the arm before said members are carried into engagement with the shoe. v

25. .In'a machine of the class described,

the combination with means for operating on a shoe, of a support for engaging the shoe at the top of the forepart, said support bein mounted for swinging movement lateral y of the shoe prior to its engagement with the shoe,and spring operated wedge mechanism for imparting said swinging movement to the support.

i 26. Ina machine of the class described, the combination with means for. operating on a shoe, of a support for engaging the shoe at the top of the. forepart, said support be in mounted for swinging movement latera1 y ofthe shoe prior to its engagement with the shoe, means for starting the machine, and spring operated mechanism controlled by said starting means for imparting paid swinging movement to the support.

27. In ,a machine of the class-described,

the combination with means for operating on a shoe, of a support for engaging the shoe at the top of the forepart, said support being mounted for swingingmovementlaterally of the shoe'prior to its engagement with the shoe, spring operated mechanism for imparting said swinging movement to the support, a locking device for holding said mechanism normally in inoperative po sition, and means automatically operativeas an incident to the starting of the machine to cause said locking device to. release {said mechanism.

28; In a machine of the class described, the combination with power operated means for performing different operations on a shoe in different automatically terminable stages of the cycle of-the machine, of starting means for initiating each'stage of the cycle, a shoe support mounted for movement from anidle position into operative relation tothe shoe. mechanism arranged to be actuated by said starting means and to impart a positioning movement to said support, and means for rendering. the starting means in its first starting 'movement ineffective to cause the support to be moved by said mechanism and forrendering it subsequently effective to cause such movement of the support.

29. In a machine of the class described, the combination with power operated means for perform ng different operations on, a

shoe in different automatically terminable stages of the cycle of the machine, of starting means forzinitiating each stage of the cycle, a shoe support arranged to be 'positioned initially in inoperative relation to the shoe, spring operated mechanism for imparting to said-support a positioning movement relatively to the shoe, a device forinitiating the operation of said mechanism,'means for rendering the starting means effective in each of its starting movements to operate said device, and additional controlling means for preventing the operation of said mechanism in the first operation of the starting means. v a

' 30, In a machine of the class described, the combination with power operated means for performing different operations on a shoe in different automatically terminable stages of the cycle of the machine, of starting means 'for initiatin each stage of the cycle, a shoe support arranged to be positionedinitially in inoperative relation to the shoe, spring operated mechanism for imparting to said support a positioning move ment relatively to the shoe, :1 locking device for holding said mechanism normally inoperative, means'for operating the locking device to release said mechanism at each operation of the startingmeans, and additional controlling means arranged to hold said mechanism in its inoperative position when -the mechanism is first released by the starting means for initiatingeach stage of the cycle, a shoe supportjarraniged to be posi-' tlOllGd initially in inoperative relation to the:

shoe, spr ng operatedfijmechanism for imf.

it it the combination with means for operating messes parting to said so "port s positioning move ment relatively to shoe, :1 lockin device for holding said mechanism normaly inop menus for-operating the locking de- "rice to release said mechanism at each operation of the sterling means, and additional god to col s to c fhunisrn initially into position said device i in e mschineoi the class descrihed, the combination with nieans'for operating with pressure against the bottom of a shoe oi shoe suppers arranged to engage the Ferrite with the startre to he held by shoe on the top oi the lorepert and comprising; ports relatively movable in response to pressure between the support and the shoe a spri p; err-unwed to yield in such relative movenieiiit oi the parts, a second spring arranged to come into play in such 7 relative movement to'oppose. an increased resistance to the pressure on the shoe, and 'PO'l-VQXDPQXMJQQ menus for control11mg said shoe support. Y t

33-. ln s machine of the class described,

one shoe, oil a shoe support comprising parts relatively movable in response to pressure between the support and the shoe,

a spring arranged to. yield in such relative movement of the parts, and a second stronger spring arranged to come nto play to prevent substantially such relative movement of the parts in response to the normal pressure of said operating means on the shoe While affording provision for yield to no commodate the support to different sizes and styles ofshoesi 34. In a machine of the class described, the combination with means for, operating on :i' shoe, of a shoe support mounted for movement into engagement "with the shoe and comprising ports relatively movable in response to resistance of the shoe, a spring rel. e id mechanism and to arranged to yield in such relative move ment of the parts, and a second. spring irrranged to come into play to oppose substantially unyielding resistance to the normal pressure of said operating means on the shoe when the shoe support is in its final oper' ative position.

85. In s machine of the class described, the combination withmeans for operating on 351109, of a shoe support mounted for movement into engagement with the shoe and comprising parts relatively movable in response to resistance of the shoe,s spring arranged to yield in such relative movement of the parts, and a second stronger spring arranged to oppose substantially unyield-= ing resistance to the normal pressure of said operating" means on the shoe when the support is in its final operative position and to yield in response to abnormal pressure between the shoe and the support to avoid danger of breakage of the machine or of damage to the shoe.

36. In a machine of the class described, the combination with means for operating on' a shoe of a shoe support comprising members arranged to engage the shoe on the top of the forepart at opposite sides of the longitudinal median line of the shoe and ,mounted for relative separatingmovement I in response to pressure of thejshoe, a stem on which said members are supported, a

holder in which said stem is slidably 

